Answer 1

Dong🌸 You can't, that is part of the challenge. Review the specificaton carefully to be sure you did each step exactly 💯 as instructed.
Normally only the first 1 or two tests are unlocked. In some cases none are unlocked.

Answer 2

You can't. The hidden test cases are locked for all the users, so you have to think about how you can improve your code to have it pass the hidden test case.